Portion of a midsole periphery



FIG. 1 is a perspective view of a portion of a midsole periphery showing my new design; and,

FIG. 2 is a side view thereof.

The broken lines immediately adjacent to the shaded areas represent an unclaimed boundary of the design. The broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a midsole periphery, as shown and described. 